Prepare switch from a64 to arm64

tools/run-tests.py

 #!/usr/bin/env python
 #
 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
@@ skipping 64 matching lines @@
                    "--concurrent-recompilation"]
 
 SUPPORTED_ARCHS = ["android_arm",
                    "android_ia32",
                    "arm",
                    "ia32",
                    "mipsel",
                    "nacl_ia32",
                    "nacl_x64",
                    "x64",
-                   "a64"]
+                   "a64",
+                   "arm64"]
 # Double the timeout for these:
 SLOW_ARCHS = ["android_arm",
               "android_ia32",
               "arm",
               "mipsel",
               "nacl_ia32",
               "nacl_x64",
               "a64"]
 
 
@@ skipping 249 matching lines @@
         os.path.join(workspace, "test", root))
     if suite:
       suites.append(suite)
 
   if options.download_data:
     for s in suites:
       s.DownloadData()
 
   for (arch, mode) in options.arch_and_mode:
     try:
+      if arch == "arm64":
+        arch = "a64"
       code = Execute(arch, mode, args, options, suites, workspace)
     except KeyboardInterrupt:
       return 2
     exit_code = exit_code or code
   return exit_code
 
 
 def Execute(arch, mode, args, options, suites, workspace):
   print(">>> Running tests for %s.%s" % (arch, mode))
 
@@ skipping 118 matching lines @@
   except KeyboardInterrupt:
     raise
 
   if options.time:
     verbose.PrintTestDurations(suites, overall_duration)
   return exit_code
 
 
 if __name__ == "__main__":
   sys.exit(Main())